Researchers from Australia’s Griffith University have demonstrated a new approach to test whether a quantum communication is secure. This method could be very important in the construction of future quantum networks.

The new technique is called quantum steering and allows us to test whether two particles are entangled, even in real-life conditions where such a task would be intractable using current technology. As reported in Science Advances, quantum steering could be used to verify entanglement for up to 80 kilometers (50 miles) of telecommunication fibers.

Entanglement is a curious quantum phenomenon and a key player in the world

Researchers from Australia’s Griffith University have demonstrated a new approach to test whether a quantum communication is secure. This method could be very important in the construction of future quantum networks.

The new technique is called quantum steering and allows us to test whether two particles are entangled, even in real-life conditions where such a task would be intractable using current technology. As reported in Science Advances, quantum steering could be used to verify entanglement for up to 80 kilometers (50 miles) of telecommunication fibers.

Entanglement is a curious quantum phenomenon and a key player in the world of quantum computing. We are used to imagining particles as distinct and independent objects, but that’s not exactly true in quantum mechanics. It is possible for them to interact in such a way that they need to be considered together. Such particles are considered entangled and even if they are separated by a great distance, when something happens to one particle it will affect the other.

Einstein didn’t like this at all since it appeared to violate the property of locality. He called entanglement “spooky action at a distance”, but it is nothing of the sort. And it will soon have a very important real-life application. An entanglement state is very delicate and this is what makes it useful for secure communications. It can’t be hacked without being destroyed.

But real-life cases are more complex. A huge number of entangled photons are being sent through fiber optics because only a small fraction will survive. So it might be possible to fake entanglement and get access to the network.

“As the length of quantum channel grows, fewer and fewer photons successfully pass through the link, because no material is perfectly transparent and absorption and scattering take their toll,” senior author Geoff Pryde, said in a statement. “This is a problem for existing quantum nonlocality verification techniques with photons. Every photon lost makes it easier for the eavesdropper to break the security by mimicking entanglement.”

Quantum steering uses another fascinating phenomenon to check if communication is secure, quantum teleportation. It removes some of the entangled photons from fiber optics and moves them to a clean and efficient quantum channel where the photons are assessed.

“Our scheme records an additional signal that lets us know if the light particle has made it through the transmission channel,” lead author Dr Morgan Weston added. “This means that the failed distribution events can be excluded up front, allowing the communication to be implemented securely even in the presence of very high loss.”

Quantum technologies promise to revolutionize computers and communications over the next few decades, but there are still many challenges to overcome.

“Online work” used to mean “money grabbing scam.” You might find a job selling things online for a com

(AP)

“Online work” used to mean “money grabbing scam.” You might find a job selling things online for a commission or writing blogs for money, but these rarely provided a living wage, or even enough spare change to justify the time commitment. Times have changed. The internet has finally become profitable, not just for startup entrepreneurs in Silicon Valley, but for regular people with everyday skills.

You don’t have to build your own website or incorporate a business (although these things certainly help.) You can enroll in a ready-made network and ply your trade among similar-minded craftspeople.

What are these services? How can you sign up? Here’s a list of side-gigs to get your hustle on.

Stock photography

You’re an ace with a camera. You capture eye-catching images, and you know how to set the scene. You can turn that skill into online income by listing your images on stock-photography sites like Shutterstock and Adobe Stock. You receive a royalty when customers purchase the right to use your work. These sites are always looking for a variety of images, whether it’s lavish food photography or eye-catching scenes of natural beauty.

You already watch plenty of videos online, so why not make a little extra money while you’re doing it? Swagbucks is a site that rewards its users with gift cards for taking surveys, watching certain videos, or conducting web searches with its search engine. You earn points by participating in Swagbucks activities and you can then redeem those points for gift cards or cash back from PayPal.

SpeakWrite

Do you have blazing fast typing fingers? Online transcription company SpeakWrite hires independent contractors and lets them set their own hours and work from home. SpeakWrite says its typists on average earn around $300 per month, while the top earners pull in over $3,000. You must first pass a typing test that judges you for speed and accuracy and requires you to have some previous experience in transcription and word processing.

Society6

Artists and designers upload their original work to Society6, which then prints the images onto a variety of products. Society6 offers an incredible range: T-shirts, pillows, wall hangings, duvet covers and iPhone cases, among countless others. Society6 handles all the fulfillment; artists can focus on their designs and receive a commission on anything sold. It’s a little like Etsy, but you don’t have to deal with physically creating or shipping your work.